Auto-stereoscopic display and method for fabricating the same

Abstract

An auto-stereoscopic display suitable for being viewed by a viewer is provided. The auto-stereoscopic display includes a display panel and an adjustable parallax barrier module. The adjustable parallax barrier module is disposed between the display panel and the viewer. The adjustable parallax barrier module includes a plurality of parallax barrier stacked upon each other. The distances between the display panel and each of the parallax barrier are different. One of the parallax barriers is selected and enabled based on the distance between the viewer and the display panel. Besides, a method of fabricating the auto-stereoscopic display is also provided.

1 . An auto-stereoscopic display suitable for being viewed by a viewer, the auto-stereoscopic display comprising:
 a display panel; and   an adjustable parallax barrier module, disposed between the display panel and the viewer, the adjustable parallax barrier module comprising a plurality of parallax barriers stacked upon each other, wherein distances between each one of the parallax barriers and the display panel are different, and one of parallax barriers is enabled based on a distance between the viewer and the display panel.   
     
     
         2 . The auto-stereoscopic display of  claims 1 , wherein the display panel comprises a plurality of pixels, a total width of two adjacent pixels is S, the distance between the display panel and the enabled parallax barrier in the adjustable parallax barrier module is t, the distance between the viewer and the enabled parallax barrier in the adjustable parallax barrier module is T, the distance between both eyes of the viewer  202  is W, and the width S, the distance t, the distance T, and the distance W satisfy the equation (1):
     t/T=S/W.    
 
     
     
         3 . The auto-stereoscopic display of  claims 1 , wherein the display panel comprises a plurality of pixels, a total width of two adjacent pixels is S, the distance between the display panel and the enabled parallax barrier in the adjustable parallax barrier module is t, a period of the enabled parallax barrier in the adjustable parallax barrier module is P, the distance between the viewer and the enabled parallax barrier in the adjustable parallax barrier module is T, and the width S, the distance t, the distance T, and the period P satisfy the equation (2):
     T/ ( T+t )= P/S.      
     
     
         4 . The auto-stereoscopic display of  claim 1 , wherein each of the parallax barriers of the adjustable parallax barrier module comprises:
 a liquid crystal layer;   a patterned micro-retarder, the liquid crystal layer being disposed between the display panel and the patterned micro-retarder, wherein the patterned micro-retarder comprises a plurality of phase retardation bar-shaped patterns and a plurality of zero retardation bar-shaped patterns, the phase retardation bar-shaped patterns and the zero retardation bar-shaped patterns are arranged alternately, and each of the phase retardation bar-shaped patterns has a phase retardation of λ/2; and   a polarizer, wherein the patterned micro-retarder is disposed between the liquid crystal layer and the polarizer.   
     
     
         5 . The auto-stereoscopic display of  claim 4 , wherein the display panel provides a first linear polarized light capable of passing through the liquid crystal layer of the enabled parallax barrier without changing its polarization; in the enabled parallax barrier, part of the first linear polarized light passing through the phase retardation bar-shaped patterns and is converted into a second linear polarized light and is blocked by the polarizer, and the other part of the first linear polarized light passing through the zero retardation bar-shaped patterns passes the polarizer. 
     
     
         6 . The auto-stereoscopic display of  claim 4 , wherein the display panel provides a first linear polarized light, the first linear polarized light is converted into a vertical polarized light after passing through the liquid crystal layer, and after passing through the phase retardation bar-shaped patterns and the zero retardation bar-shaped patterns, weight of the vertical polarized light parallel with the transmission axis of the polarizer passes through the polarizer. 
     
     
         7 . The auto-stereoscopic display of  claim 4 , wherein among the disabled parallax barrier, the display panel provides a first linear polarized light, the first linear polarized light is converted into a horizontal polarized light after passing through the liquid crystal layer, and after passing through the phase retardation bar-shaped patterns and the zero retardation bar-shaped patterns, weight of the horizontal polarized light which are parallel with the transmission axis of the polarizer passes through the polarizer. 
     
     
         8 . The auto-stereoscopic display of  claim 1 , wherein each of the parallax barriers of the adjustable parallax barrier module comprises:
 a liquid crystal layer comprising a plurality of regions, each of the regions being capable of providing a retardation of λ/2 or zero retardation; and   a polarizer, disposed at a side of the liquid crystal layer, wherein the polarizer and the viewer are disposed at the same side of the liquid crystal layer.   
     
     
         9 . The auto-stereoscopic display of  claim 8 , wherein the liquid crystal layer in the enabled parallax barrier comprises a plurality of phase retardation bar-shaped patterns and a plurality of zero retardation bar-shaped patterns, the phase retardation bar-shaped patterns and the zero retardation bar-shaped patterns are arranged alternately, and each of the phase retardation bar-shaped patterns has a phase retardation of λ/2, the display panel provides a first linear polarized light, the first linear polarized light is converted into a second linear polarized light perpendicular to the first linear polarized light by the phase retardation bar-shaped patterns, the second linear polarized light is blocked by the polarizer, and the first linear polarized light which passed through the zero retardation bar-shaped patterns pass through the polarizer. 
     
     
         10 . The auto-stereoscopic display of  claim 8 , wherein all regions of the liquid crystal layer in the disabled parallax barrier provide zero retardation, and a first linear polarized light provided by the display panel passes through the liquid crystal layer and the polarizer. 
     
     
         11 . The auto-stereoscopic display of  claim 1 , further comprising a driving mechanical structure, connected to the adjustable parallax barrier module, wherein the driving mechanical structure is capable of adjusting the distance between the adjustable parallax barrier module and the display panel. 
     
     
         12 . A method for fabricating an auto-stereoscopic display, comprising:
 providing a display panel; and   forming an adjustable parallax barrier module over the display panel, wherein the adjustable parallax barrier module comprises a plurality of parallax barriers stacked upon each other.   
     
     
         13 . The method of  claim 12 , wherein a method for forming the adjustable parallax barrier module comprises:
 forming a liquid crystal layer, a patterned micro-retarder and a polarizer over the display panel sequentially to form a parallax barrier; and   forming another liquid crystal layer, another patterned micro-retarder and another polarizer over the parallax barrier sequentially to form another parallax barrier.   
     
     
         14 . The method of  claim 12 , wherein a method for forming the adjustable parallax barrier module comprises:
 forming a liquid crystal layer and a polarizer over the display panel sequentially to form a parallax barrier; and   forming another liquid crystal layer and another polarizer over the parallax barrier sequentially to form another parallax barrier.   
     
     
         15 . The method of  claim 12 , further comprising providing a driving mechanical structure connected to the adjustable parallax barrier module, wherein the driving mechanical structure is capable of adjusting the distance between the adjustable parallax barrier module and the display panel.